Exam 29: Development and Inheritance

The ________ is formed by the allantois,blood vessels,and yolk sac.

Identical twins that share body structures are called Siamese or ________ twins.

The solid ball of cells that has been likened to a mulberry is called a

The first stage of labor is the ________ stage.

The extraembryonic membrane that forms blood is the

The blood vessel that carries oxygenated blood away from the placenta is the ________.

Ectoderm is to ________ as mesoderm is to ________.

A new mother tells you that when she nurses her baby,she feels as if she is having menstrual cramps.How would you explain this phenomenon?

Non-sex chromosomes are called

A 5-6-kg (11-13-lb)infant usually requires about ________ mL of milk per day.

The traits of an individual controlled by his or her genotype are his or her ________.

During gastrulation,

During early development,the Y chromosome produces a substance called "testis determining factor" (TDF)that causes the indifferent gonad to become a testis.This would be an example of

The alternate forms of any one gene are called

A zygote whose genotype is XX will develop as a ________.

Genes that appear on the X chromosome are said to be ________.

How many chromosomes do human somatic cells contain?

Factors involved in senescence include all of the following,except a(n)

Which embryonic germ layer forms the brain and spinal cord?

Polyspermy results in